<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>js作业</title>

</head>
<body>
<button onclick="color('red')">设为红色</button>
<button onclick="color('yellow')">设为黄色</button>
<button onclick="color('blue')">设为蓝色</button>
<input type="color" onchange="color4(this)">

<script src="js/script.js"></script>
</body>
</html>